Obviously, since HubSpot keys on email address and therefore guarantees uniqueness in this contact property, every link created using this technique is guaranteed to be 'unique' as long as you've REQUIRED all contact records to have email addresses.

Additionally, depending on your use case, this could / would prove problematic should your recipient forward the email containing their 'unique link'.

Obviously, since HubSpot keys on email address and therefore guarantees uniqueness in this contact property, every link created using this technique is guaranteed to be 'unique' as long as you've REQUIRED all contact records to have email addresses.

Additionally, depending on your use case, this could / would prove problematic should your recipient forward the email containing their 'unique link'.